Jeremy Brahm e-mailed me with links to some old photos of the center-court and free-throw/key areas in the University of Oregon's McArthur Court. I've visited "Mac Court" myself, so I thought this was an excellent opportunity to put together a description of the court's evolution over the decades.
The first photo in our sequence, provided by Jeremy, is of a 1960s-era UO men's team situated along the free-throw line, so most of the key is showing. As Jeremy asks seemingly in amazement, "How about the Donald Duck spinning a basketball on his finger for the University of Oregon?"
Next, also from Jeremy, is a team picture of the 1980-81 Lady Ducks at center court. Seeing this black-and-white photo leads me to recall that the color scheme was something like this PowerPoint image I just slapped together (I was an undergrad student at UCLA at the time, so I watched Pac-10 games from Oregon on TV fairly frequently):
Next is a picture I took myself, during a 2001 visit to Eugene. As can be seen (albeit fuzzily), the midcourt logo consists of a large O, with a duck marching through, and interlocked UO symbols are located to the lower-left and upper-right of the center circle.
Finally, the Ducks' present layout consists of a singular, bold O at midcourt, with "OREGON" shown immediately beneath it. It's the same kind of O that's used on the school's football helmets.